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' • tnedy/Jenks Consultants t ' 3.2.2 Characterization Activities at Valley View Thoroughbred Farm A groundwater sample was collected at the Valley View Thoroughbred Farm Well (#1) on ' 25 June 2004 by Musco representatives. Water was collected from the outlet at the pressure tank after it was allowed to purge for a few minutes. The water was collected in sample bottles provided by A and L Agricultural Laboratories and was submitted for analysis to JL Analytical Services, a state-certified analytical laboratory located in Modesto, California. The groundwater sample was analyzed for FDS, volatile dissolved solids (VDS), BOD, arsenic, ' potassium, sodium, pH, TDS, electrical conductivity, chloride, nitrate-N, orthophosphate, calcium, magnesium, iron, boron, total hardness as CaCO3, and total alkalinity as CaCO3. The analytical results are presented in Table 1. ' 3.2.3 Hydrogeology Both the Jepsen Webb Ranch and Valley View Thoroughbred Farm properties are located ' within the Tracy Subbasin of the San Joaquin Valley Basin. Based on lithologies observed in CPT borings advanced at the Jepsen Webb Ranch property, the soil stratigraphy can be divided into two zones: a "shallow" zone that extends from the surface to approximately 35 to 60 feet t bgs and is comprised of clay, silt, and sand; and a "deep" zone beginning between 35 and 60 feet bgs that consists predominantly of clay and is at least 93 feet in thickness. The clay contains occasional lenses of sand that hold very little water. The clay appears to occur in a ' zone just above or in the Corcoran Clay Member of the Tulare Formation, extends underneath the basin, and serves as an aquitard. ' Since CPT borings did not indicate a water-bearing formation, and since groundwater grab samples were not obtained using HydropunchTA/ sampling, other data were used to evaluate groundwater quality in the reclamation areas.These data include groundwater data collected ' from an existing well, a new monitoring well near the reclamation areas, and regional groundwater data. ' 3.2.4 Groundwater Quality Groundwater TDS concentrations collected from the Hansen Road Well, the Kagehiro Well, and the Valley View Thoroughbred Farm are plotted on Figure 3, the map of regional TDS ' concentrations. As discussed above, groundwater in an elongated area at the base of the Diablo Range and in ' the area of the Mendota Canal exhibits a poorer quality than groundwater to the northeast or southwest. Kennedy/Jenks collected a groundwater sample for a groundwater yield study for the City of Tracy in 1990. The sample had a TDS concentration of 2,110 mg/l. This sample shows ' that groundwater quality has not degraded since 1990 when the City of Tracy sample was collected. ' Presently, very limited data are available near each of the proposed offsite irrigation areas. At the Jepsen Webb Ranch property, the TDS concentration is 1,800 mg/I and the TDS measured at the Valley View Thoroughbred Farm is 2,800 mg/l. These TDS concentrations are consistent with those detected in other wells located in the area, including the wells penetrating the deeper Reclamation Report, Page 9 ' Musco Family Olive Company 9'usgmuptaERinyob'A2102?iCN O(I_muscaelie`F:`r¢porL==4eGamaGen ejNruso rklamNia�repot text E.1204 doc